How to attach LV lights to paver wall?

Hi everyone, I'm new to this forum, but thought it would be worth posting my question here! I want to put low-voltage lights to light our patio. Ideally I would like to mount the half-circle lights under the lip of an 18" techo-block (concrete paver) seat wall that surrounds the patio. I can tuck the wire into the lip, but what is the best way to attach the lights to the wall. I hesitate to use a concrete drill, because I don't want to risk damaging the wall. I am hoping there is an adhesive solution that might work. Any ideas? The biggest concern I have with the adhesive is the moisture that gets into the concrete breaking the bond. Thanks!